The Democratic party would of course do better if they dump the idiotic identity politics part and come up with actual progressive solutions for those who have lost their jobs due to automation or offshoring. But they don't want to.
That would involve getting off their Wall Street based gravy train.
Sure, Bernie proved you
can fundraise from your voters, instead of being a pet for the 1%. But that's hard, and looks like work, and it certainly isn't as fun as rubbing elbows at $1000 a plate dinners. (And probably doesn't help with the post-facto bribes and sinecures either.)
The Dem establishment isn't really interested in winning jack for their constituents, they just need to be a credible enough alternative to the GOP that the 1% keep buying them off just to be safe.
